There had now 4.7 earhquake in crete but here in this seismograph: [link to bbnet.gein.noa.gr] is interesting data now because it reacts about those crete earthquakes. It could mean that thera magma chamber reacts also what is normal. What is not normal this looks like something is broke beneath santorini. I mean something could be rising and there is not many options what it is.